Classification of Spencer 1925
Cl. Ophiuroidea Gray 1840 [brittle star]
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Fm. †Furcasteridae Stürtz 1899
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G. †Furcaster Stürtz 1886
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†Furcaster leptosoma Salter 1857
†Furcaster trepidans Spencer 1925
Invalid names: Eoluidia Stürtz 1886 [synonym], Eophiurites Stürtz 1899 [synonym], Palaespondylus Stürtz 1899 [synonym], Palastropecten Stürtz 1886 [synonym], Rhodostoma Sollas and Sollas 1912 [synonym], Squamaster Ringueberg 1886 [synonym], Sturtzura Gregory 1897 [synonym], Sympterura Bather 1905 [synonym]
Invalid names: Hallasteridae Spencer 1925 [empty]
Fm. †Eoactinidae Spencer 1919
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G. †Palaeosolaster Stürtz 1899
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†Palaeosolaster gregoryi Stürtz 1899
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Invalid names: Echinasterias spinosus Stürtz 1899 [synonym], Echinodiscus multidactylus Stürtz 1899 [synonym], Echinostella traquairi Stürtz 1899 [synonym], Helianthaster roemeri Clarke 1908 [synonym]
Invalid names: Echinasterias Stürtz 1899 [synonym], Echinodiscus Stürtz 1899 [synonym], Echinostella Stürtz 1899 [synonym]
†Palaeocoma cylindrica Billings 1857
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Invalid names: Protaster forbesi Hall 1860 [synonym]
†Protaster leptosoma Salter 1857
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Invalid names: Eoluidia decheni Stürtz 1886 [synonym], Furcaster palaeozoicus Stürtz 1886 [synonym], Palastropecten zitteli Stürtz 1886 [synonym], Squamaster echinatus Ringueberg 1886 [synonym], Sympterura minveri Bather 1905 [synonym]